28457979 has 24 divisors (see below), whose sum is σ = 42326592. Its totient is φ = 16866720.

The previous prime is 28457971. The next prime is 28457993. The reversal of 28457979 is 97975482.

It is not a de Polignac number, because 28457979 - 2³ = 28457971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28457971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92544 + ... + 92850.

It is an arithmetic number, because the mean of its divisors is an integer number (1763608).

Almost surely, 2^28457979 is an apocalyptic number.

28457979 is a deficient number, since it is larger than the sum of its proper divisors (13868613).

28457979 is a wasteful number, since it uses less digits than its factorization.

28457979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 374 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The square root of 28457979 is about 5334.6020470134. The cubic root of 28457979 is about 305.3055399157.

The spelling of 28457979 in words is "twenty-eight million, four hundred fifty-seven thousand, nine hundred seventy-nine".